What Size Breaker for Sump Pump?
A sump pump requires a 15A breaker with 14 AWG wire on a 120V dedicated circuit.
🔌 Wire Length & Voltage Drop Check
Sump Pump Wiring Guide — NEC Requirements
Sump pumps should be on a dedicated 15A or 20A/120V circuit. GFCI protection is required per NEC 210.8 for basement/crawl space receptacles, but this can cause nuisance tripping.
Pro Tip
💡 Consider a GFCI breaker rather than a GFCI outlet to reduce nuisance tripping. Battery backup sump pumps are recommended.
Why a 15A Breaker?
The sump pump draws approximately 8A at 120V (960W). A 15A breaker provides adequate protection.
Wire Sizing per NEC 310.16
For a 15A/120V circuit, 14 AWG copper is required per NEC Table 310.16 at 75°C. For runs over 75 feet, upsize to 12 AWG. Use our Wire Size Calculator and Voltage Drop Calculator.
Complete Parts List
To wire a sump pump circuit: a 15A single-pole breaker, 14 AWG NM-B cable (Romex) for interior runs or THHN/THWN-2 in conduit for exposed runs, a NEMA 5-15 or 5-20 receptacle, cable clamps, and appropriate junction boxes.
Disclaimer: This guide is for reference only. All electrical work must be performed by or verified by a licensed electrician. Local codes may differ from NEC.